Centrifugal separator-drum.



- Patented Dec. 24. I90L.

F. 0'. mLssou; CENTRIFUGAL StZ-PARAT-OR DRUM.

(Application filed Feb. 7, 1900.

(No Model.)

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U ITED STATES PATENT (")rricnt FRANS OSCAR NILSSON, OF WAXHOLM, SWEDEN,ASSIGNOR. TO AKTIEBO- LAGET SVEASEPARATORN, OF STOCKHOLM, SWEDEN.

CENTRIFUGAL SEPARATOR-DRUM.

gECIFICATION forming part of Letters Patent No. 689,620, dated December24, 1901. Application filed February "7, 1900. Serial No. 4,338. (Nomodel) To. aZZ whom it may somewa Be it known that I, FRANS OSCARNILssON, a subject of the King of Sweden and Norway, and a resident ofBrannudden, Waxholm, Sweden, have invented a newand useful Improvementin Centrifugal Separator-Drums, of which the following isaspecification, reference being had to the drawings accompanying andforming a part hereof.

The present invention relates to improvements in covers for suchcentrifugal separator-drums as are journaled both above and below thedrum. I

In separator-drums of the aforesaid kind it as been usual to attach thecover to the drum by means of screw-threads provided on the inside ofthe cover and engaging with corresponding screw-threads on the outsideof the drum proper. Said method of attaching the cover to the drum hasbeen found to have the disadvantage that the screw-threads on account ofthe great strain they are subjected to will soon wear enough to make thejoint between the cover and the drum loose. order to make the jointstiff again, it has been found necessary to force out the edges of thedrum proper by some suitable mechanical contrivance.

The object of the present invention is to provide such improvements inthe joints that the same will be so strong as to lessen the wear of thescrew-threads; but when worn out the edges of the drum may be pressedout without the use of special contrivances.

The invention consists in making the upper part of the inside of thedrum slightly conical and in providing lugs on the inside of the coveradapted to bear against said conicity oi the drum and of such strengththat when the screw-threads become worn in screwing the cover to thelugs will force out the edge of the cover enough to make the joint stiffagain.

The invention is illustrated in the accom= panying drawings, in whichFigure 1 shows a vertical section of the up: per part of the drum andthe cover, and Fig". 2 shows a plan view of the cover seen from thebottom.

Referring to the drawings, a designates the separator-drum, the upperedge of which on the outsideis provided with screw-threads I) and on theinside made slightly conical, as shown at e, Fig. 1. The cover 0 of thedrum is on the inside provided with screw-threads (1, adapted to 'engagewith the said screwthreads I), and with lugs f, which are conical, so asto fit against the said conicity e' of the drum. When the cover isscrewed onto the drum, the said lugs bear tightly against the saidconicity of the drum, making the joint between the cover and drum muchstronger than would be the case without said lugs, thus lessening theWear of the screw threads. When the screw threads are worn enough tomake the joint unsteady, it is only necessary to screw the joint tighterto the drum, when the lugs will force the edge of the drum against theedge of the cover, making the joint stifi again.

Having now described my invention, I claim- In a centrifugalseparator-drum the combination of, a drum proper having a' verticalscrew-threaded wall and a beveled interior wall, a cover threaded to fitthe said screw, and conical interior lugs on the said cover adapted toengage the beveled portion of the said drum, substantially as and forthe pur= pose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANS OSCAR NILSSON.

Witnesses:

GERDA PINDKVIST, GUSTAF ISPALT.

